21.  You are showing a high school student who is shadowing you (following you around) in your lab class, a Light Compound Microscope. Name 3 things you will tell him/her that will help the student to recognize the oil immersion objective lens.

Compare and Contrast (give 1 similarity and 1 difference) between DNA polymerase and Reverse Transcriptase.

Compare the Normal mRNA to the mRNA with mutation sequence below.  Pick the choice that describes the mutation at the DNA level and the protein level.  5′ UUU  CAU  AAG   UAC  AGC 3′  — Normal mRNA 5′ UUU  CAU  AAG   UAA  AGC 3′  — mRNA with mutation  

8.  What is the difference between Phenol red and Neutral red indicators?

18.  Outline the 7 major steps in gram staining (HINT: washing and blotting are not major steps for the purposes of this question), include the time and reason for each step .

17.  You streaked your unknown culture on a Blood Agar plate.  Describe 3 possible types of hemolysis that can be seen on the blood Agar Plate (HINT: give full description).

Which of the following is NOT used to classify a virus?

Which choice describes a true difference between photolyase and nucleotide excision DNA repair mechanisms?

27.  These are Urease Media.  Describe and give the rational for the reactions in Tubes A and B only.    

The burst size is a clear area formed in a bacterial lawn by bacteriophage infection.